Methanol-to-Olefin Conversion on Silicoaluminophosphate Catalysts: Effect of Brønsted Acid Sites and Framework Structures

催化作用 化学 布朗斯特德-洛瑞酸碱理论 甲醇 烯烃纤维 选择性 热重分析 酸强度 无机化学 沸石 碳氢化合物 多相催化 有机化学
作者
Weili Dai,Xin Wang,Guangjun Wu,Naijia Guan,Michael Hunger,Landong Li
出处
期刊:ACS Catalysis [American Chemical Society]
卷期号:1 (4): 292-299 被引量:155
标识
DOI:10.1021/cs200016u
摘要

Silicoaluminophosphates (SAPO) with different framework structures and amounts of Brønsted acid sites, that is, SAPO-34, SAPO-41, SAPO-11, and SAPO-46, were synthesized and studied as catalysts for the methanol-to-olefin (MTO) conversion. Besides the well-known SAPO-34 catalyst, also SAPO-41 exhibits a good MTO performance with a methanol conversion of 100% and a selectivity to light olefins of about 70% at the reaction temperature of 723 K, which maintains up to a time-on-stream of 10 h. The Brønsted acid sites of silicoaluminophosphate catalysts employed in this study were characterized by means of 1H MAS NMR spectroscopy. These studies were performed with unloaded samples for studying the type and number of OH groups and after loading of ammonia for determining the amount of accessible Brønsted acid sites. The occluded organic species formed on the catalysts during the MTO reaction were analyzed by in situ UV/vis spectroscopy, thermogravimetry-differential thermal analysis (TG-DTA), and gas chromatography-mass spectrometry (GC-MS). On the basis of the characterization and catalytic results, we discuss the effects of Brønsted acid sites and framework structures on the catalytic performance of silicoaluminophosphates in the MTO conversion. The amount of Brønsted acid sites strongly affects the adsorption of methanol and the formation of hydrocarbon pool compounds as well as the catalyst deactivation. On the other hand, the framework structures of the silicoaluminophosphates under study influence the diffusion of products and thus control the product selectivity of the MTO reaction.
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
PDF的下载单位、IP信息已删除 (2025-6-4)

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
刚刚
1秒前
qcf发布了新的文献求助10
1秒前
1秒前
董海涛发布了新的文献求助10
1秒前
orixero应助干净的夜蓉采纳,获得20
2秒前
烟花应助sylnd126采纳,获得10
2秒前
火星上涔完成签到,获得积分20
4秒前
Dr_Chu完成签到 ,获得积分10
5秒前
李健的小迷弟应助老师好采纳,获得10
5秒前
5秒前
摸鱼划水发布了新的文献求助10
5秒前
Richard发布了新的文献求助10
5秒前
领导范儿应助qcf采纳,获得10
9秒前
10秒前
慕华完成签到 ,获得积分10
10秒前
10秒前
10秒前
华仔应助怡然的元绿采纳,获得30
10秒前
嘻嘻嘻呀完成签到 ,获得积分10
10秒前
黄同学完成签到,获得积分20
11秒前
画月发布了新的文献求助10
11秒前
汉堡包应助无聊的亿先采纳,获得10
12秒前
李好好发布了新的文献求助10
14秒前
黄同学发布了新的文献求助10
14秒前
摸鱼划水完成签到,获得积分10
15秒前
lele完成签到,获得积分10
15秒前
秋風发布了新的文献求助10
16秒前
在水一方应助派大星采纳,获得10
16秒前
SYLH应助椰青冰萃采纳,获得30
16秒前
在水一方应助盼盼采纳,获得10
16秒前
19秒前
19秒前
20秒前
20秒前
如此发布了新的文献求助10
22秒前
王叮叮发布了新的文献求助10
24秒前
wdy111应助喵了个咪采纳,获得10
25秒前
Tracy完成签到,获得积分10
25秒前
Hexagram发布了新的文献求助10
25秒前
高分求助中
Picture Books with Same-sex Parented Families: Unintentional Censorship 1000
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Microbiology and Health Benefits of Traditional Alcoholic Beverages 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 310
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3979984
求助须知:如何正确求助?哪些是违规求助? 3524121
关于积分的说明 11219921
捐赠科研通 3261562
什么是DOI,文献DOI怎么找? 1800703
邀请新用户注册赠送积分活动 879263
科研通“疑难数据库(出版商)”最低求助积分说明 807232