Cost‐Effective Adsorption of Oxidative Coupling‐Derived Ethylene Using a Molecular Sieve

Abstract

The adsorption of ethylene (C 2 H 4 ) from a mixture simulating the products obtained during the oxidative coupling of CH 4 using a commercial molecular sieve (MOS) is investigated. A joint experimental and theoretical approach has been employed. The adsorbent's trapping capacity decreases at higher temperatures, while the breakpoint time drops when the inlet C 2 H 4 concentration increases. The Dubinin-Radushkevich isotherm model can better describe the adsorption of C 2 H 4 onto the MOS. Pore diffusion is the rate-determining step given that the Bangham's kinetic model was the more suitable for this adsorption process. Finally, the low activation energy obtained corroborates the predominance of physical adsorption.

Synthesis and Mathematical Modelling of the Preparation Process of Nickel-Alumina Catalysts with Egg-Shell Structures for Syngas Production via Reforming of Clean Model Biogas

“…The impregnation processes have been described by numerous mathematical models [50][51][52][53][54][55][56][57][58], which incorporate several factors that determine the active phase's content and the final profile of its macro-distribution, including (i) time of impregnation; (ii) pH, temperature, and initial concentration of the impregnating solution; (iii) the use of additives; and (iv) the previous state of the support [50]. Whereas, historically, many earlier studies were focused on the description of the "diffusion-adsorption" mechanism that controls the active phases profile deposited into formed support material particles adopting simple adsorption mechanisms, later attempts were focused more closely on the physical process of adsorption [7,56,59]. Despite the high number of models available in the literature and the diversity of their complexity, there is still a lack of models that combine detailed descriptions of the imbibition, diffusion, and adsorption processes.…”

Adsorptive Desulfurization of Condensate Contains Aromatic Compounds Using a Commercial Molecular Sieve

“…The selection of an effective adsorbent is a critical parameter in this process, and a wide variety of adsorbents based on zeolite, metal oxide, mesoporous material, activated carbon, modified carbon, and metal–organic frameworks have been used. , These materials can have amorphous (activated carbons) and/or crystalline structures (zeolites) at both the nano- and macroscale . The main requirements for efficient desulfurization are high surface area per unit volume, stable structure, low cost, high regeneration capability, and selectivity. , Molecular sieves or synthetic zeolites not only have regenerability, stable structure, and a high number of mesopores but also have high selectivity and affinity toward sulfur compounds; therefore, they have been known as commercial adsorbents in the desulfurization process …”

“…21,22 Molecular sieves or synthetic zeolites not only have regenerability, stable structure, and a high number of mesopores but also have high selectivity and affinity toward sulfur compounds; therefore, they have been known as commercial adsorbents in the desulfurization process. 23 The main difference between the types of synthetic zeolites is their structure and silicon−aluminum ratio (Si/Al). The polarity of zeolites can be changed by the Si/Al ratio.…”

“… 21 , 22 Molecular sieves or synthetic zeolites not only have regenerability, stable structure, and a high number of mesopores but also have high selectivity and affinity toward sulfur compounds; therefore, they have been known as commercial adsorbents in the desulfurization process. 23 …”

Unique Interaction between Layered Black Phosphorus and Nitrogen Dioxide

“…Exposure during pregnancy and early postnatal periods to nitrogen dioxide (NO 2 ) or sulfur dioxide (SO 2 ) is associated with childhood allergy diseases [5]. Adsorbents are increasingly used in eliminating hazardous gases, such as molecular sieves [6], porous carbon [7], metallic clusters [8], graphene [9] and MXenes [10]. Two-dimensional (2D) nanomaterials have great advantages in gas adsorption over other materials, owing to quantum size effects, large surface areas, excellent electronic/photoelectronic performance, etc.…”