南开大学Landong Li研究团队近日在甲醇-烯烃转化催化剂研究中取得进展。2022年10月27日出版的《美国化学会杂志》发表了这项成果。

该研究提出了一种采用预焦化-蒸化相结合的方法，在SAPO-34催化剂的晶体中心定向构建活性萘基团的可行策略，不仅可以将原本较低的烯烃选择性提高到约89%（乙烯和丙烯），而且在甲醇-烯烃转化过程中，催化剂的使用寿命延长了约3.7倍。

结构照明显微镜、原位紫外-可见光谱和在线质谱分析阐释了萘类物质在预焦化和蒸化过程中的时空分布和演化。这种一石二鸟的策略对含有粘结剂的商品化SAPO-34催化剂也适用，在甲醇制烯烃工业中显示出了良好的前景。

据了解，烯烃选择性和催化剂寿命是工业甲醇制烯烃催化剂的两个关键指标。目前，同时获得高烯烃选择性和较长的催化剂使用寿命是非常困难的。

附：英文原文

Title: Directional Construction of Active Naphthalenic Species within SAPO-34 Crystals toward More Efficient Methanol-to-Olefin Conversion

Author: Chang Wang, Liu Yang, Mingbin Gao, Xue Shao, Weili Dai, Guangjun Wu, Naijia Guan, Zhaochao Xu, Mao Ye, Landong Li

Issue&Volume: October 27, 2022

Abstract: Olefin selectivity and catalyst lifetime are two key metrics for industrial methanol-to-olefin catalysts. Currently, it is very difficult to obtain high olefin selectivity and long catalyst lifetime at the same time. Herein, a feasible strategy combining precoking and steaming to directionally construct the active naphthalenic species within the crystal center of the SAPO-34 catalyst has been developed, which can not only promote the lower olefin selectivity to ～89% (ethylene and propylene) but also prolong the catalyst lifetime by ～3.7-fold in the methanol-to-olefin conversion. Structured illumination microscopy, in situ ultraviolet–visible spectroscopy, and online mass spectrometry elucidate the spatiotemporal distribution and evolution of the naphthalenic species during the precoking and steaming processes. This one-stone-two-birds strategy is applicable to a commercial SAPO-34 catalyst containing a binder, demonstrating its bright prospect in the methanol-to-olefin industry.

DOI: 10.1021/jacs.2c10495

Source: https://pubs.acs.org/doi/10.1021/jacs.2c10495