Key Takeaways & Executive Findings
- •• • The review identifies four design strategies for cellulase-mimetic solid acid catalysts: electrostatic anchoring, hydrophobic microenvironment engineering, spatial confinement, and covalent lock-and-key mechanisms, each addressing specific substrate recognition and catalytic challenges. • • Biomimetic catalysts enhance cellulose hydrolysis by mimicking cellulase binding domains (CBDs), achieving improved catalytic affinity, selectivity, and durability through local concentration enhancement and synergistic adsorption-catalysis effects. • • Despite progress, mass-transfer resistance and insufficient structural robustness remain critical bottlenecks in complex biomass conversion systems, limiting industrial scalability. • • Integration of carbon quantum dots (CQDs) into biomimetic catalysts is proposed as a novel route to develop efficient, recyclable, and hierarchically organized catalytic systems for sustainable cellulose valorization.
Abstract
The dense crystalline structure and limited accessibility of cellulose severely hinder its efficient catalytic conversion. In response, biomimetic solid acid catalysts inspired by cellulase binding domains (CBDs) have emerged as a promising strategy to enhance cellulose hydrolysis by mimicking the substrate recognition and enrichment functions of natural enzymes. This review systematically summarizes recent advances in the design of CBD-mimetic solid acids based on four representative strategies: electrostatic anchoring, hydrophobic microenvironment engineering, spatial confinement, and covalent lock-and-key mechanisms. The underlying principles of these approaches, including substrate-specific recognition, local concentration enhancement, and synergistic “adsorption-catalysis” effects, are critically discussed to elucidate their contributions in improving catalytic affinity, selectivity, and durability. Despite significant progress, challenges such as mass-transfer resistance and insufficient structural robustness remain in complex biomass conversion systems. Looking forward, the integration of sub-enzymatic materials, such as carbon quantum dots (CQDs), into biomimetic catalysts offers new opportunities to achieve efficient, recyclable, and hierarchically organized catalytic systems, thereby providing a powerful route for the sustainable valorization of cellulose and other lignocellulosic resources.
1. Introduction
Cellulose, the most abundant natural polymer, presents a recalcitrant crystalline structure that impedes efficient hydrolysis, a key step in its conversion to biofuels and chemicals. Traditional enzymatic systems, while effective, suffer from high costs and operational limitations, whereas conventional acid catalysts lack substrate specificity and cause equipment corrosion. These bottlenecks have driven the exploration of biomimetic solid acid catalysts that emulate the substrate-binding and catalytic functions of cellulase enzymes.
This review systematically examines recent advances in designing cellulase-mimetic solid acids, focusing on four strategies: electrostatic anchoring, hydrophobic microenvironment engineering, spatial confinement, and covalent lock-and-key mechanisms. By mimicking the natural enzyme's ability to recognize and enrich cellulose, these catalysts aim to enhance hydrolysis efficiency, selectivity, and durability. The integration of carbon quantum dots (CQDs) is highlighted as a promising direction to overcome mass-transfer limitations and achieve recyclable, hierarchically organized catalytic systems for sustainable biomass conversion.
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WANG Youhua, CAO Shuling, LONG Tianyi, ZOU Chuanjun, CHENG Xu, ZHU Wanbin, WANG Hongliang (2026). Design Strategies and Recent Advances in Cellulase-Mimetic Solid Acid Catalysts. Journal of Fuel Chemistry and Technology. https://doi.org/10.1016/S1872-5813(25)60626-8
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Frequently Asked Questions
What are the main design strategies for cellulase-mimetic solid acid catalysts and how do they improve cellulose hydrolysis?
The review identifies four strategies: electrostatic anchoring, hydrophobic microenvironment engineering, spatial confinement, and covalent lock-and-key mechanisms. These approaches enhance substrate recognition and local concentration, leading to improved catalytic affinity, selectivity, and durability in cellulose hydrolysis.
What are the key challenges in scaling up biomimetic solid acid catalysts for industrial biomass conversion?
Mass-transfer resistance and insufficient structural robustness in complex biomass systems remain critical challenges. These issues can reduce catalytic efficiency and catalyst lifetime, hindering industrial adoption.
How does the integration of carbon quantum dots (CQDs) address current limitations in biomimetic catalysts?
CQDs offer opportunities to create hierarchically organized catalytic systems with enhanced recyclability and efficiency. Their sub-enzymatic size and tunable surface chemistry can improve mass transfer and catalytic performance, potentially overcoming existing bottlenecks.
What specific performance metrics are reported for these biomimetic catalysts?
The abstract does not provide specific numerical metrics, but it emphasizes improvements in catalytic affinity, selectivity, and durability. For quantitative data, readers should refer to the full paper, which likely includes yields, turnover frequencies, and stability tests.
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