Highly efficient photocatalytic reduction of CO 2 on amine-functionalized Ti-MCM-41 zeolite
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RESEARCH PAPER
Highly efficient photocatalytic reduction of CO2 on amine-functionalized Ti-MCM-41 zeolite Wenhui Jia & Qiuye Li & Lina Zhang & Lili Hou & Taifeng Liu & Gupta Bhavana & Jianjun Yang
Received: 17 April 2020 / Accepted: 10 September 2020 # Springer Nature B.V. 2020
Abstract Efficient adsorption and utilization of carbon dioxide play an important role in mitigating the greenhouse effect and developing clean energy. Surface functionalization of photocatalyst is an efficient method to promote the adsorption of CO2 and convert it into hydrocarbon fuels. In this work, tetraethylenepentamine (TEPA) is used to functionalize Ti-MCM-41 molecular sieve photocatalyst to enhance the adsorption and activation of CO2. Ti-MCM-41 molecular sieve was modified without any precious metal additives. When the content of TEPA was 1%, the yield of CH4 was 232 ppm g−1 h−1. Furthermore, the results indicate that high impregnation amount of TEPA causes strong and higher adsorption of CO2 but inefficient for its conversion. This is probably due to the blockage of the channel when the impregnation amount of TEPA exceeds the threshold value, which hinders the further conversion of CO2 molecules. Functionalization Ti-MCM-41 zeolite photocatalyst with amino group is the prime reason for its excellent CO2 adsorption followed by activation capacity. In the future, this proposed composite might come up as a perspective photocatalyst in the field of photocatalysis for the purpose of environment remediation.
W. Jia : Q. Li (*) : L. Zhang : L. Hou : T. Liu : G. Bhavana : J. Yang (*) National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China e-mail: [email protected] e-mail: [email protected]
Keywords CO2 photoreduction . Ti-MCM-41 zeolite . Organic amine . Surface functionalization . Nanostructured catalysts
Introduction Carbon dioxide emissions have increased significantly in the past few years due to the increasing demand for energy to meet social needs. This phenomenon leads to changes in global climate, such as the greenhouse effect caused by rising global temperature, which is harmful to the whole ecosystem. In this case, photocatalytic reduction of carbon dioxide into hydrocarbon fuels is an ideal way to reduce carbon dioxide emissions and realize recycling utilization of CO2 resources (Mikkelsen et al. 2010; Wang et al. 2011; Habisreutinger et al. 2013; Goeppert et al. 2014). It is widely believed that there are three key issues in photocatalysis: solar light harvesting, charge separation, and surface reactions. Significant achievements have been made in optimizing the first two steps (Tu et al. 2014; Xie et al. 2016), so this article focuses on strategies to enhance the adsorption and activation of CO2 molecules for surface reactions. Recently, some materials have been studied to capture CO2, such as oxides (Wang et al. 2008), activated carbon (Himeno et al. 2005), metal-organic skeleton (Caskey et al. 2008), and mesoporous silica (Dao et
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