Renewing a certificate issued by a CA

I have a few certificates in a certificate store will be expiring shortly. I want to renew the certificate. I can do this manually but is it possible to automate this using Powershell. I've read about a couple of Powershell third-party modules like Quest Active Directory and Public Key Infrastructure on Codeplex. Can anyone point me to any library that could achieve this task? I am attaching an image of the task that has to be done for clarity.