亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整的填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Reactions on ZSM-5-type zeolite catalysts

化学 催化作用 吸附 沸石 无机化学 乙烯 解吸 碳氢化合物 ZSM-5型 丙烯 有机化学 吸附
作者
John R. Anderson
出处
期刊:Journal of Catalysis [Elsevier]
卷期号:58 (1): 114-130 被引量:283
标识
DOI:10.1016/0021-9517(79)90250-1
摘要

Catalytic reactions and sorption measurements have been carried out with ZSM-5 and silicalite catalysts which are distinguished by variation in skeletal heteroatom concentration. The catalysts were used in both the hydrogen-exchanged and sodium-exchanged forms. Sorption measurements were made with the hydrocarbons n-hexane, 3-methylpentane, and 2,2-dimethylbutane, and with the bases ammonia, n-butylamine, t-butylamine, and 4-methylquinoline. Catalytic reactions were carried out on both unpoisoned and base-poisoned catalysts using methanol, propylene, and 3-methylpentane reactants. In addition, the behavior of ethylene and ethanol reactants was also explored. The ease of base sorption and hydrocarbon sorption has been assessed in terms of effective molecular size in relation to the channel size of the catalyst, and this factor is also used as a basis for explaining the effectiveness of bases for poisoning the catalytic reactions. Temperature-programmed desorption (TPD) measurements with ammonia have been used to assess the energetic distribution of sorption sites for bases, and very strong binding sites with a TPD maximum for ammonia at about 780 °K have been identified as the probable sites used in the conversion processes. The main features of the catalytic conversion process are discussed. It is concluded that sorbed C3,C4 olefinic residues are general intermediates leading to aromatic formation. Under most circumstances, ethylene was relatively unreactive, and it is inferred that a sorbed C2 residue, which is related to ethylene by sorption and desorption, is an unlikely general intermediate. A mechanism is suggested for the formation of sorbed C3,C4 olefinic residues, and for initial carbon-carbon bond formation from methanol. Catalyst self-poisoning was observed with all catalysts except hydrogen-exchanged ZSM-5.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
shizaibide1314完成签到,获得积分10
8秒前
友好的听寒完成签到,获得积分10
11秒前
13秒前
16秒前
lqy完成签到,获得积分20
1分钟前
岁月荣耀完成签到 ,获得积分10
2分钟前
宽宽完成签到,获得积分10
3分钟前
青树柠檬完成签到 ,获得积分10
3分钟前
3分钟前
十二个发布了新的文献求助30
3分钟前
十二个完成签到,获得积分10
4分钟前
科研通AI2S应助科研通管家采纳,获得10
4分钟前
WY完成签到,获得积分10
5分钟前
WY发布了新的文献求助10
5分钟前
6分钟前
andrele发布了新的文献求助10
6分钟前
6分钟前
6分钟前
6分钟前
张可完成签到 ,获得积分10
6分钟前
ding应助donwe采纳,获得10
7分钟前
donwe完成签到,获得积分10
7分钟前
7分钟前
donwe发布了新的文献求助10
7分钟前
7分钟前
大大完成签到 ,获得积分10
7分钟前
0911wxt完成签到,获得积分10
7分钟前
0911wxt发布了新的文献求助10
8分钟前
FashionBoy应助科研通管家采纳,获得10
8分钟前
赵依乐完成签到 ,获得积分20
10分钟前
10分钟前
Yuzz完成签到,获得积分10
10分钟前
11分钟前
爱科研的小东完成签到,获得积分20
11分钟前
11分钟前
铎铎铎完成签到 ,获得积分10
12分钟前
99411发布了新的文献求助20
13分钟前
ajing完成签到,获得积分10
13分钟前
酷波er应助99411采纳,获得10
13分钟前
翩璸完成签到 ,获得积分10
13分钟前
高分求助中
Handbook of Fuel Cells, 6 Volume Set 1666
Floxuridine; Third Edition 1000
Tracking and Data Fusion: A Handbook of Algorithms 1000
Sustainable Land Management: Strategies to Cope with the Marginalisation of Agriculture 800
消化器内視鏡関連の偶発症に関する第7回全国調査報告2019〜2021年までの3年間 500
One Man Talking: Selected Essays of Shao Xunmei, 1929–1939 500
Framing China: Media Images and Political Debates in Britain, the USA and Switzerland, 1900-1950 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 内科学 物理 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 冶金 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 2860616
求助须知:如何正确求助?哪些是违规求助? 2465550
关于积分的说明 6683841
捐赠科研通 2156852
什么是DOI,文献DOI怎么找? 1145858
版权声明 585052
科研通“疑难数据库(出版商)”最低求助积分说明 563018