检索结果-南通市图书馆

Thermostability of Nanosized HZSM-5 Zeolite

在线全文

学校读者我要写书评

暂无评论

chinese Journal of catalysis 2000年第3期21卷 195-196页

作者： ZHANG Weiping 1, HAN Xiuwen 1, LIU Xiumei 1, BAO Xinhe 1, GUO Xinwen 2, WANG Xiangsheng 2 (1 state key laboratory of catalysis, dalian institute of chemical physics, The chinese academy of sciences, dalian 116023, china 2 laboratory of Comprehens 中科院大连化学物理所催化基础国家重点实验室辽宁大连 1 1 6 0 2 大连理工大学辽宁大连 1 1 6 0 1

The thermostability of nanosized HZSM-5 zeolite was studied using multinuclear solid-state NMR technique. Nanosized zeolites have received considerable attention for their unique catalytic properties. When the crystal size of HZSM-5 is reduced to nanoscale, it exhibits higher catalytic activity, less coke, and longer catalytic life in CH3OH conversion to hydrocarbons and C2H4 oligomerization. It was found that thermostability of nanosized HZSM-5 is not as good as that of microsized HZSM-5, especially at higher temperatures. It can be ascribed to two processes: dealumination and desilicification in nanosized HZSM-5 during calcination. For microsized HZSM-5, the dealumination dominates and there is much less desilicification. These are related with the higher energy of Si and Al atoms on the surface of nanosized HZSM-5. Thus, they can be more easily extracted from the framework upon thermal treatment.

关键词： nanosized HZSM 5 zeolite thermostability solid state NMR

Adsorption and reaction of CO and O_2 on the Ag/Pt(110) surface studied by photoemis-sion electron microscopy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese Science Bulletin 2001年第12期46卷 998-1002页

作者： HUANG Weixin & BAO Xinhestate key laboratory of catalysis, dalian institute of chemical physics, chinese academy of sciences, dalian 116023, china state key laboratory of catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian China

The Ag/Pt(110) model catalyst was prepared by evaporating silver on Pt(110). Adsorption and reaction of CO and O2 on Ag/Pt(110) surface were studied in situ by photo-emission electron microscopy (PEEM) during the pressure range of 10-5-10-2 Pa at 480 K. The Ag/Pt(110) surface consisted of Pt(110), AgPt interface and Ag area after annealing at 500 K. The dosing pressure of CO and O2 had a larger influence on their adsorption on the Ag area than on the Pt(110) and AgPt interface. Small Pt clusters formed on the Ag area and AgPt interface, which had a stronger ability to adsorb CO than Pt(110) terrace. The existence of Ag had an obvious influence on the kinetic of CO oxidation on Pt(110). No pattern was observed on the AgPt interface under the same condition when the formation of reaction-diffusion waves occurred on Pt(110).

关键词： silver Pt(110) carbon monoxide oxygen adsorption reaction photoemission electron microscopy.

A ^(13)CO isotopic study on the CO promotion effect in methane dehydroaromatization reaction over a Mo/HMCM-49 catalyst

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2010年第1期19卷 1-5页

作者： Songdong Yao, Changyong Sun, Juan Li, Xiumin Huang, Wenjie Shen state key laboratory of catalysis, dalian institute of chemical physics, chinese academy of sciences, dalian 116023, Liaoning, china [a] state key laboratory of catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China

The promotion effect of CO in methane dehydroaromatization was investigated using ^13CO probe molecules. By alternative injection of ^13CO to the methane feed, the distribution of ^13CxC6-xH6（x= 0-3） products changed significantly, confirming the participation of ^13CO in the reaction network. The addition of ^13CO did not change the conversion of CH4 but improved slightly the durability of the methane dehydroaromatization （MDA） reaction, which might be caused by the interaction of the dissociated oxygen species and the deposited carbon species. The ratio of ^13CxC6-xH6 （x = 0-3） varied with the time on stream, which was determined by the competitive reactions of methane decomposition and ^13CO dissociation.

关键词： ^13CO labeling methane dehydroaromatization Mo/HMCM-49 catalyst deactivation

DEHYDROGENATION AND AROMATIZATION OF CH4 IN THE ABSENCE OF O2 ON Mo/HZSM-5

在线全文

学校读者我要写书评

暂无评论

chinese Journal of catalysis 1996年第2期17卷 99-100页

作者： Liu Wei Xu Yide Liu Shetian Guo Xiexian (state key laboratory of catalysis, dalian institute of chemical physics,chinese academy of sciences, dalian 116023) state key laboratory of catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023

ＤＥＨＹＤＲＯＧＥＮＡＴＩＯＮＡＮＤＡＲＯＭＡＴＩＺＡＴＩＯＮＯＦＣＨ＿４ＩＮＴＨＥＡＢＳＥＮＣＥＯＦＯ＿２ＯＮＭｏ／ＨＺＳＭ－５￥ＬｉｕＷｅｉ；ＸｕＹｉｄｅ；ＬｉｕＳｈｅｔｉａｎ；ＧｕｏＸｉｅｘｉａｎ（ＳｔａｔｅＫ... 详细信息

ＤＥＨＹＤＲＯＧＥＮＡＴＩＯＮＡＮＤＡＲＯＭＡＴＩＺＡＴＩＯＮＯＦＣＨ＿４ＩＮＴＨＥＡＢＳＥＮＣＥＯＦＯ＿２ＯＮＭｏ／ＨＺＳＭ－５￥ＬｉｕＷｅｉ；ＸｕＹｉｄｅ；ＬｉｕＳｈｅｔｉａｎ；ＧｕｏＸｉｅｘｉａｎ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＣａｔ...

关键词： methane dehydrogenation aromatization Mo/HZSM- 5

THE　THEORY　OF　RESONANT　AND　NONRESONANT　PUMP－PROBE　POLARIZATIONSPECTROSCOPYFORGROUND－stateCOHERENCE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese chemical Letters 1996年第4期7卷 353-356页

作者： Yi ZHAO Guo Zhong HE(state key laboratory of Molecular Reaction Dynamics, dalian institute of chemical physics. chinese academy of sciences, dalian 116023) chinese ACAD SCI DALIAN INST CHEM PHYSSTATE KEY LAB MOL REACT DYNAMDALIAN 116023PEOPLES R CHINA

A density matrix treatment of the time evolution of the third order polarization response describing the ground state coherence induced by ultrafast pulses is given. The explicit formulas of polarization response for nonresonant and resonant excitation are derived. The results show that the signal can be greatly enhanced in case of resonance. For specification, we discuss the ground- state rotational coherence based on the if irreducible tensor algebra.

关键词：

INFRARED STUDIES OF Co/Al_2O_3 CATALYSTS: CO AND NO ADSORPTION

在线全文

学校读者我要写书评

暂无评论

chinese chemical Letters 1995年第2期6卷 127-128页

作者： Xin Sheng LI and Qin XIN(state key laboratory of catalysis,dalian institute of chemical physics,chinese academy of sciences, P.O.Box 110, dalian 116023) chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China

s: Three kinds of Co sites,i.e. tetrahedral(Co[o]), cobalt cobalt sites and bulk Co3O4 are characterized by infrared spechoscopy of CO and NO adsothed on reduced and sueded Co/Al2O3 at room temperature.

关键词： Al Co NO INFRARED STUDIES OF Co/Al2O3 CATALYSTS CO AND NO ADSORPTION

CATALYTIC　ACTIVITY　AND　OF　SUPPORTED　W_2N　HYDRODENITROGENATION　CATALYST

在线全文

学校读者我要写书评

暂无评论

chinese chemical Letters 1995年第9期6卷 819-822页

作者： Lei SHI Xin Ping WANG , Qin XIN(state key laboratory of catalysis,dalian institute of chemical physics,chinese academy of edeners,dalian,116023) chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China

Abstract: Tungsten nitride supported over activated carbon has been used as the catalyst for pyridine hydrodeitrogenation (HDN) for the first time. It has ho found that W2N/C has high catalytic activity and selectivi...

关键词：

Algebraic approach to stretching vibrational spectrum of H_2S

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第21期44卷 1961-1964页

作者： FENG Zhaochi, XIONG Guang, YANG Qihua, XIN Qin and LI Canstate key laboratory of catalysis , dalian institute of chemical physics , chinese academy of sciences , dalian 116023, china state key laboratory of catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian China

The stretching vibrational spectra of H2S have been calculated by using the algebraic model, and the local mode characteristics have been analyzed. Within the vibrational quanta v=5, the standard deviation is 1.71 cm-... 详细信息

关键词： algebraic model vibrational spectrum local mode.

Syngas Production Using an Oxygen-Permeating Membrane Reactor with Cofeed of Methane and Carbon Dioxide

在线全文

学校读者我要写书评

暂无评论

chinese chemical Letters 2000年第7期11卷 631-634页

作者： Zong Ping SHAO Hui DONG Guo Xing XIONG Wei Shen YANG(state key laboratory of catalysis, dalian institute of chemical physics,chinese academy of sciences, P.O. Box 110, dalian 116023) chinese Acad Sci Dalian Inst Chem Phys State Key Lab Catalysis Dalian 116023 Peoples R China

CH4-CO2-O-2 reforming to syngas in a never *** oxygen-permeable membrane reactor using LiLaNiO/gamma-Al2O3 as catalyst was successfully reported. Excellent reaction performance was achieved with around 92% methane conversion efficiency, 95% CO2 conversion rate, and nearly 8.5mL/***(2) oxygen permeation flux. In contrast to the oxygen permeation model with the presence of large concentration of CO2 (under such condition the oxygen permeation flux deteriorates with time), the oxygen permeation flux is really stable under the CH4CO2-O-2 reforming condition.

关键词： ceramic membrane reactor oxygen permeation methane syngas