The researchers perform catalytic tests in a continuous fixed-bed reactor until deactivation, as reflected in the conversion (X) versus cumulative turnover (CT) curves in the figure. The location and distribution of coke in the micropores is revealed by powder neutron diffraction, whereas gas chromatography−mass spectrometry, ¹³C and ¹H magic-angle spinning nuclear magnetic resonance and operando diffuse reflectance ultraviolet−visible spectroscopy are used to study its structure and composition. They find that for ZSM-5 and ZSM-35 coke predominantly forms along the 10-MR channels, with a higher concentration around the pore intersecting regions, and mostly consists of mono- and tricyclic arenes. For SSZ-13 coke is found in the 8-MR cages but it is also interconnected along the channels forming larger structures.

Original reference: ACS Catal. 14, 5593−5604 (2024)

研究人员在连续固定床反应器中进行催化测试，直至失活，如图中的转化率 ( X ) 与累积周转率 (CT) 曲线所示。通过粉末中子衍射揭示焦炭在微孔中的位置和分布，而气相色谱-质谱联用、¹³ C和¹ H魔角旋转核磁共振和操作漫反射紫外-可见光谱则用于研究其结构和分布。作品。他们发现，对于 ZSM-5 和 ZSM-35，焦炭主要沿着 10-MR 通道形成，在孔交叉区域周围浓度较高，并且主要由单环和三环芳烃组成。对于 SSZ-13，焦炭存在于 8-MR 笼中，但它也沿着通道互连，形成更大的结构。

原始参考： ACS Catal。 14、5593−5604 (2024)