During catalytic pyrolysis of HFC-134a over γ-alumina, the formation of HF and coke causes catalyst deactivation. Catalyst deactivation and product selectivity depend on the contact time during catalytic pyrolysis of HFC-134a as reported in this paper. γ-Alumina calcined at 650 ^oC was used as the catalyst due to its higher quantity of acidic sites and larger surface area, which are crucial for catalytic pyrolysis. X-ray diffraction (XRD), scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDS), and thermogravimetric analysis (TGA) of the catalysts were performed to determine the influence of contact time and flow rate of HFC-134a. 2 mL/min of HFC-134a balanced with nitrogen to 25, 50, 100, and 200 mL/min total flow rates was studied at 600 ^oC. 200 mL/min showed a 9.4 h catalyst lifetime with a small number of by-products. Shorter contact time between HFC-134a and HF with the catalyst was found to be the key to the longer lifetime of the catalyst. The catalyst lifetime was decreased with an increase in the HFC-134a input amount. Among 2, 4, and 6 mL/min input of HFC-134a, 2 mL/min showed the longest catalytic activity followed by 4 and 6 mL/min, respectively. Conversion of γ-alumina into AlF₃ and deposition of coke were responsible for the deactivation.

在 HFC-134a 经γ-氧化铝催化热解过程中，HF 和焦炭的形成导致催化剂失活。如本文所述，催化剂失活和产物选择性取决于 HFC-134a 催化热解过程中的接触时间。γ-氧化铝在 650 ^o下煅烧C 被用作催化剂，因为它具有更多的酸性位点和更大的表面积，这对于催化热解至关重要。对催化剂进行 X 射线衍射 (XRD)、扫描电子显微镜-能量色散 X 射线光谱 (SEM-EDS) 和热重分析 (TGA)，以确定接触时间和 HFC-134a 流速的影响。在 600 ^o下研究了 2 mL/min 的 HFC-134a 与氮气平衡至 25、50、100 和 200 mL/min 的总流速C. 200 mL/min 的催化剂寿命为 9.4 小时，带有少量副产物。发现 HFC-134a 和 HF 与催化剂之间更短的接触时间是延长催化剂寿命的关键。催化剂寿命随着HFC-134a输入量的增加而降低。在 2、4 和 6 mL/min 的 HFC-134a 输入中，2 mL/min 显示最长的催化活性，其次是 4 mL/min 和 6 mL/min。γ-氧化铝向AlF _{3 的}转化和焦炭的沉积是失活的原因。