生物乙醇在双金属铜催化剂上转化为乙烯的环保转化
Emily Gaitán Chavarría1, Thamara Picado Espinoza1, Esteban Durán Herrera1
1Chemical Engineering School, Universidad de Costa Rica, San José, 2060, Costa Rica.
-上的铜和催化剂有效地将生物乙醇转化为乙烯,实现高选择性. Cu/γ-Al2O3催化剂表现最好,失活是由于位点阻塞和表面基化.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 生物乙醇转化为有价值的化学物质对于可持续能源至关重要.
- 从生物乙醇生产乙烯为传统方法提供了更绿色的替代方案.
- 开发高效和稳定的催化剂是工业应用的关键.
研究的目的:
- 为了研究生物乙醇在g-Al2O3支持的铜和催化剂上的气相转化为乙烯.
- 评估催化剂性能,包括乙烯选择性和生物乙醇转化率.
- 了解催化剂停用机制,以改善长期稳定性.
主要方法:
- 通过共同沉,然后进行预处理来制备催化剂.
- 在大气压和450°C下进行气相催化试验.
- 使用XRD,SEM,EDS,TEM,TGA,FTIR,拉曼和N2物理吸收进行全面的催化剂表征.
主要成果:
- 单金属Cu/γ-Al2O3催化剂实现了最高的乙烯选择性 (~90%) 和显著的生物乙醇转化 (57-86%).
- NiCu1:7双金属催化剂也显示出高度的乙烯.
- 在Cu/γ-Al2O3的最佳条件下,在350°C降解和35毫升/分钟N2流量下,乙烯度为0.18-0.21g/L.
结论:
- /γ-Al2O3是生物乙醇转化为乙烯的高度选择性催化剂.
- 催化剂的停用遵循一级动力学,主要是由于位点阻塞和表面基化,而不是碳酸沉积物.
- 进一步优化减温温度和气体流量可以提高乙烯产量.
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